SIM network unlock PINGeneral

I have rooted my Wildfire S with S-On but can't unlock network lock. I tried with HTC super tool (Htc Desire unlock won't work of course), went throw forum and all over the net, and don't know what to do.

I bought (I know it sound lame) in other state used phone for my little daughter, Please help me or I will have to buy brand new one